CEC Abstracts in PDF format (as of 7/3/07) - CEC-ICMC 2013

CEC 2007 - Abstracts
C1-F-02 Cryogenic Thermal Performance Testing of
Bulk-Fill and Aerogel Insulation Materials
B.E. Scholtens, J.E. Fesmire, J.P. Sass, NASA KSC;
S.D. Augustynowicz, K.W. Heckle, Sierra Lobo, Inc.
The research testing and demonstration of new bulk-fill materials for
cryogenic thermal insulation systems was performed by the
Cryogenics Test Laboratory at NASA Kennedy Space Center.
Thermal conductivity testing under actual-use cryogenic conditions is
a key to understanding the total system performance encompassing
engineering, economics, and materials factors. A number of bulk fill
insulation materials, including aerogel beads, glass bubbles, and
perlite powder, were tested using a new cylindrical cryostat. Boundary
temperatures for the liquid nitrogen boil-off method were typically
293 K and 77 K. Tests were performed as a function of vacuum
pressure level from high vacuum to no vacuum conditions. Results
are compared with other complementary test methods in the range of
300 K to 10 K. Various testing techniques are shown to be required to
obtain a complete understanding of the operating performance of a
material and to establish a basis for answers to design engineering
questions.
C1-F-03 Multilauer Insulation for Atlas
S. Kozub, K. Polkovnikov, A. Hartchenko, Institute for
High Energy Physics.
Multilayer insulation consists of aluminized mylar and mylar cloth
spacer for ATLAS (LHC) was manufactured and tested at Institute for
High Energy Physics (Protvino, Russia). The paper presents
description of facility for the multilayer insulation test as well as
results of gassing in vacuum rate and heat leakage measurements for
the insulation.
C1-F-04 Testing of a Vacuum Insulated Flexible Line
With Flowing Liquid Nitrogen During the Loss of
Insulating Vacuum
J.A. Demko, M.J. Gouge, R.C. Duckworth, Oak
Ridge National Laboratory; M. Roden, Southwire
Co..
Long length vacuum insulated lines are used to carry flowing liquid
nitrogen in several high temperature superconducting cable projects.
An important, but rare, failure scenario is the abrupt or catastrophic
loss of the thermal insulating vacuum producing a rapid increase in
heat transfer to the liquid nitrogen stream. In this investigation, a
vacuum superinsulated 3 inch by 5 inch NPS is subjected to an abrupt
loss of vacuum in order to measure the response of a flowing liquid
nitrogen stream and the temperature response of the cryostat. The
measured outlet stream temperature has a slight peak shortly after the
loss of vacuum incident and drops to a steady state value. The heat
loads measured before and after the vacuum loss event are reported.
Some measurements of the temperatures in the multi-layer
superinsulation are also discussed.
Research sponsored by the U.S. Department of Energy - Office of
Electricity Delivery and Energy Reliability, Superconductivity
Program for Electric Power Systems under contract DE-AC05-
00OR22725 with Oak Ridge National Laboratory, managed and
operated by UT-Battelle, LLC.
C1-F-05 Radiation heat measurement on thermally
isolated double-pipe for DC superconducting power
transmission
M. Hamabe, S. Yamaguchi, Chubu University; A.
Ninomiya, Seikei University; Y. Ishiguro, S. Kusaka,
JFE Steel Corporation.
Multilayer insulation (MLI) is a strong tool to reduce the radiation
heat and is widely used for the cryogenic systems. However, the use
of the MLI leads to a huge increase of the surface area in vacuum; it
takes extremely long time to reach a satisfactory vacuum for the
thermal isolation, or the nitrogen gas flushing is needed several times.
We have started the experiment by using the test bench of the DC
superconducting (DC-SC) power cable in Chubu University. Since the
DC-SC power cable is free from the AC losses, the acceptable
radiation heat can be higher for this cable than the AC-SC power
cable. Therefore, we are studying the possibility of the radiation shield
without the MLI. The vacuum pumping process and the radiation heat
are measured for the thermally isolated double-pipes (of the same size
as those for the DC-SC PT cable) with the various surfaces. While the
radiation heat for the liquid-nitrogen-filled double-pipe with the MLI
radiation shield was 1/100 of that with the bare stainless steel surface,
the reachable vacuum pressure with the MLI was 10 times poorer than
that with the bare surface. We will also discuss a novel and
convenient radiation shielding method for the different surface
processes in this work.
C1-F-06 Low temperature heat transfer properties of
electrical insulation for the Next European Dipole
J. Polinski, B. Baudouy, CEA Saclay; S. Canfer, G.
Ellwood, RAL.
The heat transfer properties of the electrical multilayer insulations of
the Next European dipole has been tested under various conditions at
low temperature. The electrical insulation is made of E-glass fibre
with a plain weave and RAL epoxy system 227 (DGEBF epoxy resin
and DETD aromatic hardener). The samples have been tested in
superfluid helium where heat is applied perpendicularly to the fibres
between 1.6 K to 2.1 K and their thermal conductivity, longitudinal to
the fibres, had been also measured at low temperature below 77 K.
This work was supported in part by the European Community–
Research Infrastructure Activity under the FP6 “Structuring the
European Research Area” program (CARE, contract number RII3-
CT-2003-506395).
C1-F-07 Flexible Aerogel Composites for Cryogenic
Insulation
R. Trifu, R. Begag, G. Gould, O. Evans, S. White,
Aspen Aerogels, Inc..
Low-density, flexible aerogel composites offer a variety of
performance advantages over other insulation materials for cryogenic
insulation applications, particularly Multi-Layer Insulation (MLI).
These advantages include reduced weight, increased durability, lower
total costs, and dramatic improvements in lead-times required for
fabrication / installation of the insulation with equal thermal
performance. Additionally, large error bars often associated with the
thermal modeling of MLI can be eliminated with the use of aerogel
composites. These low density aerogel composites have been found
to be compatible with sensitive space sensors. Outgassing data along
with encapsulation concepts for the aerogel composites will be
discussed. A ‘higher’ density aerogel composite for insulating liquid
oxygen transfer lines and storage containers will also be presented.
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